Feature: Calendars are now exportable shareable so Third Party Calendar services can read them, also added recoccurence to calendar, and all day along with sperating the time fields and click in a box to add calendar event is possible

admin/database_updates/2.5.8.php

@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * ITFlow - Database update to version 2.5.8 (from 2.5.7)
+ * Included by admin/database_updates.php - do not access directly
+ */
+
+defined('FROM_DB_UPDATER') || die("Direct file access is not allowed");
+
+    // Calendars can now be published as a read-only ICS feed for Google Calendar,
+    // Nextcloud and any other subscription client. The key is stored in cleartext,
+    // matching invoice_url_key and shared_items.item_key - hashing it would buy
+    // nothing here (anyone holding the database already holds the events the key
+    // grants access to) and would make the URL impossible to re-copy for a second
+    // device without breaking every existing subscriber.
+    //
+    // The UNIQUE key is on a nullable column, so unshared calendars all keep NULL.
+    // The column is explicitly utf8mb4_bin: the table default is utf8mb4_general_ci,
+    // which compares case-insensitively, and the key alphabet is mixed-case
+    // base64url - a _ci column would throw away entropy on lookup and make the
+    // UNIQUE index blind to case.
+    mysqli_query($mysqli, "ALTER TABLE `calendars`
+        ADD COLUMN `calendar_feed_key` varchar(64) COLLATE utf8mb4_bin DEFAULT NULL AFTER `calendar_color`,
+        ADD COLUMN `calendar_feed_busy_only` tinyint(1) NOT NULL DEFAULT 0 AFTER `calendar_feed_key`,
+        ADD COLUMN `calendar_feed_created_at` datetime DEFAULT NULL AFTER `calendar_feed_busy_only`,
+        ADD COLUMN `calendar_feed_accessed_at` datetime DEFAULT NULL AFTER `calendar_feed_created_at`,
+        ADD UNIQUE KEY `calendar_feed_key` (`calendar_feed_key`)");